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- Title
Martian magnetic field properties before the termination of its core dynamo.
- Authors
Wang, TianYuan; Wei, ZiGang; Jiang, WeiYuan; Kuang, WeiJia; Ma, ShiZhuang
- Abstract
Observed Martian crustal magnetism shows that the Mars does not possess a global-scale, dynamo-driven intrinsic magnetic field. In addition, the remnant field at the surface is hemi-spherically asymmetric. Our earlier simulation results suggest that the Martian dynamo could be sub-critical near its end (the energy required to sustain a subcritical dynamo is less than that to excite the dynamo) and the generated field morphology is non-dipolar. We further the study to examine the characteristics of the magnetic field via Empirical Orthogonal Function (EOF) analysis on the subcritical dynamo solutions with the Rayleigh number R = 2480 (below the critical point for the onset of the Martian dynamo). Our results show that the magnetic field is dominantly equatorial dipolar. Reversals and excursions occur frequently, and the magnetic dipole moment does not vary monotonically in time.
- Subjects
MAGNETIC fields; MAGNETIC dipoles; EQUATORIAL satellites; ORTHOGONAL functions; RAYLEIGH number
- Publication
SCIENCE CHINA Earth Sciences, 2013, Vol 56, Issue 8, p1452
- ISSN
1674-7313
- Publication type
Article
- DOI
10.1007/s11430-012-4510-4